diff --git a/3/coursework/src/.gitignore b/3/coursework/src/.gitignore
index edb52da..b59bb3c 100644
--- a/3/coursework/src/.gitignore
+++ b/3/coursework/src/.gitignore
@@ -1,3 +1,2 @@
 /target/
 /**/scrapyard/
-/database/data/
diff --git a/3/coursework/src/Cargo.lock b/3/coursework/src/Cargo.lock
index 679dee7..8431ca4 100644
--- a/3/coursework/src/Cargo.lock
+++ b/3/coursework/src/Cargo.lock
@@ -326,17 +326,6 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
 
-[[package]]
-name = "authentication"
-version = "0.1.0"
-dependencies = [
- "argon2",
- "database",
- "derive_more",
- "garde",
- "thiserror 2.0.11",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.4.0"
@@ -911,7 +900,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "database"
+name = "data"
 version = "0.1.0"
 dependencies = [
  "chrono",
@@ -1791,6 +1780,7 @@ dependencies = [
  "iced_core",
  "log",
  "rustc-hash 2.1.0",
+ "tokio",
  "wasm-bindgen-futures",
  "wasm-timer",
 ]
@@ -2260,18 +2250,12 @@ version = "0.12.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "234cf4f4a04dc1f57e24b96cc0cd600cf2af460d4161ac5ecdd0af8e1f3b2a38"
 
-[[package]]
-name = "macros"
-version = "0.1.0"
-
 [[package]]
 name = "main"
 version = "0.1.0"
 dependencies = [
  "iced",
- "macros",
  "strum",
- "widget",
 ]
 
 [[package]]
@@ -3464,6 +3448,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "service"
+version = "0.1.0"
+dependencies = [
+ "argon2",
+ "data",
+ "derive_more",
+ "garde",
+ "thiserror 2.0.11",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.6"
@@ -4323,6 +4318,13 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
+[[package]]
+name = "view"
+version = "0.1.0"
+dependencies = [
+ "iced",
+]
+
 [[package]]
 name = "walkdir"
 version = "2.5.0"
@@ -4692,13 +4694,6 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7219d36b6eac893fa81e84ebe06485e7dcbb616177469b142df14f1f4deb1311"
 
-[[package]]
-name = "widget"
-version = "0.1.0"
-dependencies = [
- "iced",
-]
-
 [[package]]
 name = "winapi"
 version = "0.3.9"
diff --git a/3/coursework/src/Cargo.toml b/3/coursework/src/Cargo.toml
index 78b5bb8..99ee3bb 100644
--- a/3/coursework/src/Cargo.toml
+++ b/3/coursework/src/Cargo.toml
@@ -1,3 +1,3 @@
 [workspace]
 resolver = "2"
-members = ["app/*", "libs/*", "database"]
+members = ["data", "main", "service", "view"]
diff --git a/3/coursework/src/app/authentication/src/lib.rs b/3/coursework/src/app/authentication/src/lib.rs
deleted file mode 100644
index 1a8b0c9..0000000
--- a/3/coursework/src/app/authentication/src/lib.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-// use database::port::user;
-
-mod repository;
-mod service;
diff --git a/3/coursework/src/app/authentication/src/service.rs b/3/coursework/src/app/authentication/src/service.rs
deleted file mode 100644
index 0e7fa60..0000000
--- a/3/coursework/src/app/authentication/src/service.rs
+++ /dev/null
@@ -1,212 +0,0 @@
-use crate::repository::{Authenticated, AuthenticationRepository};
-use database::port::user;
-
-use derive_more::{Deref, Into};
-use garde::Validate;
-
-#[derive(thiserror::Error, Debug)]
-pub enum Error {
-    // Login
-    #[error("login not found")]
-    LoginNotFound,
-    #[error("incorrect password")]
-    IncorrectPassword,
-    // Register
-    #[error("username is taken")]
-    NameExists,
-    #[error("email is already in use")]
-    EmailExists,
-    // Shared
-    #[error("invalid password: {0}")]
-    InvalidPassword(Box<dyn std::error::Error>),
-    #[error("data source error: {0}")]
-    Repository(Box<dyn std::error::Error>),
-}
-
-pub type Result<T = (), E = Error> = std::result::Result<T, E>;
-
-#[derive(Clone, Deref, Into)]
-pub struct Name(user::Name);
-
-impl TryFrom<String> for Name {
-    type Error = Box<dyn std::error::Error>;
-
-    fn try_from(value: String) -> std::result::Result<Self, Self::Error> {
-        #[derive(Validate)]
-        #[garde(transparent)]
-        struct Username<'a>(#[garde(alphanumeric, length(chars, min = 2, max = 31))] &'a str);
-
-        Username(&value).validate()?;
-        Ok(Self(user::Name::try_from(value)?))
-    }
-}
-
-#[derive(Clone, Deref, Into)]
-pub struct Email(user::Email);
-impl TryFrom<String> for Email {
-    type Error = Box<dyn std::error::Error>;
-
-    fn try_from(value: String) -> std::result::Result<Self, Self::Error> {
-        #[derive(Validate)]
-        #[garde(transparent)]
-        pub struct Email<'a>(#[garde(email, length(chars, max = 255))] &'a str);
-
-        Email(&value).validate()?;
-        Ok(Self(user::Email::try_from(value)?))
-    }
-}
-
-// #[derive(Validate, Deref, From, Into)]
-// #[garde(transparent)]
-// pub struct Password(#[garde(length(chars, min = 8))] pub String);
-
-pub enum LoginBy {
-    Name(Name),
-    Email(Email),
-}
-
-pub struct LoginData {
-    login: LoginBy,
-    password: String,
-}
-
-pub struct RegisterData {
-    pub name: Name,
-    pub email: Email,
-    pub password: String,
-}
-
-pub trait AuthenticationContract {
-    async fn name_available(&self, name: Name) -> Result;
-    async fn email_available(&self, email: Email) -> Result;
-
-    async fn login(&mut self, data: LoginData) -> Result<Authenticated>;
-    async fn register(&mut self, data: RegisterData) -> Result<Authenticated>;
-}
-
-// Service
-
-use crate::repository::Get;
-
-use argon2::{
-    Argon2,
-    password_hash::{
-        self, PasswordHash, PasswordHasher, PasswordVerifier, SaltString, rand_core::OsRng,
-    },
-};
-
-impl From<password_hash::Error> for Error {
-    fn from(error: password_hash::Error) -> Self {
-        match error {
-            password_hash::Error::Password => Self::IncorrectPassword,
-            _ => Self::InvalidPassword(error.into()),
-        }
-    }
-}
-
-pub struct AuthenticationService<R>
-where
-    R: AuthenticationRepository,
-{
-    repository: R,
-}
-
-impl<R> AuthenticationService<R>
-where
-    R: AuthenticationRepository,
-{
-    pub const fn new(repository: R) -> Self {
-        Self { repository }
-    }
-}
-
-impl<R> AuthenticationContract for AuthenticationService<R>
-where
-    R: AuthenticationRepository,
-{
-    async fn name_available(&self, name: Name) -> Result {
-        if self
-            .repository
-            .get_user(Get::Name(name.0))
-            .await
-            .map_err(Error::Repository)?
-            .is_some()
-        {
-            return Err(Error::NameExists);
-        };
-        Ok(())
-    }
-    async fn email_available(&self, email: Email) -> Result {
-        if self
-            .repository
-            .get_user(Get::Email(email.0))
-            .await
-            .map_err(Error::Repository)?
-            .is_some()
-        {
-            return Err(Error::EmailExists);
-        };
-        Ok(())
-    }
-
-    async fn login(&mut self, data: LoginData) -> Result<Authenticated> {
-        if data.password.chars().count() < 8 {
-            return Err(Error::InvalidPassword(
-                "password must be longer than 8 characters".into(),
-            ));
-        }
-
-        let user = match data.login {
-            LoginBy::Name(name) => self.repository.get_user(Get::Name(name.0)),
-            LoginBy::Email(email) => self.repository.get_user(Get::Email(email.0)),
-        }
-        .await
-        .map_err(Error::Repository)?
-        .ok_or(Error::LoginNotFound)?;
-
-        Argon2::default().verify_password(
-            data.password.as_bytes(),
-            &PasswordHash::new(user.password())?,
-        )?;
-
-        self.repository
-            .start_session(user)
-            .await
-            .map_err(Error::Repository)
-    }
-
-    async fn register(&mut self, data: RegisterData) -> Result<Authenticated> {
-        if data.password.chars().count() < 8 {
-            return Err(Error::InvalidPassword(
-                "password must be longer than 8 characters".into(),
-            ));
-        }
-
-        self.name_available(data.name.clone()).await?;
-        self.email_available(data.email.clone()).await?;
-
-        // Get PHC string ($argon2id$v=19$...)
-        let password = Argon2::default()
-            .hash_password(data.password.as_bytes(), &SaltString::generate(&mut OsRng))?
-            .to_string()
-            .try_into()
-            .map_err(|e| Error::InvalidPassword(Box::from(e)))?;
-
-        let user = self
-            .repository
-            .create_user(user::New {
-                name: data.name.0,
-                email: data.email.0,
-                password,
-                last_used: None,
-            })
-            .await
-            .map_err(Error::Repository)?;
-
-        self.repository
-            .start_session(user)
-            .await
-            .map_err(Error::Repository)
-    }
-}
-
diff --git a/3/coursework/src/database/compose.yaml b/3/coursework/src/assets/compose.yaml
similarity index 84%
rename from 3/coursework/src/database/compose.yaml
rename to 3/coursework/src/assets/compose.yaml
index 5c2cec9..3faafd3 100644
--- a/3/coursework/src/database/compose.yaml
+++ b/3/coursework/src/assets/compose.yaml
@@ -5,7 +5,7 @@ services:
     ports:
       - "127.0.0.1:3306:3306"
     volumes:
-      - ./data:/var/lib/mysql
+      - ../../repo-database:/var/lib/mysql
       - ./init:/docker-entrypoint-initdb.d/:ro
     environment:
       MYSQL_ROOT_PASSWORD: password # yes, I know
diff --git a/3/coursework/src/database/init/init.sql b/3/coursework/src/assets/init/init.sql
similarity index 100%
rename from 3/coursework/src/database/init/init.sql
rename to 3/coursework/src/assets/init/init.sql
diff --git a/3/coursework/src/database/.sqlx/query-014cf2ec55142a17047ad7c469685df75ae8e3c95a1a7c6c21be7b5624a82ae1.json b/3/coursework/src/data/.sqlx/query-014cf2ec55142a17047ad7c469685df75ae8e3c95a1a7c6c21be7b5624a82ae1.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-014cf2ec55142a17047ad7c469685df75ae8e3c95a1a7c6c21be7b5624a82ae1.json
rename to 3/coursework/src/data/.sqlx/query-014cf2ec55142a17047ad7c469685df75ae8e3c95a1a7c6c21be7b5624a82ae1.json
diff --git a/3/coursework/src/database/.sqlx/query-063059de083c42956506d991bc04472929e6b2618ab13eb90e772ad9bd9c1984.json b/3/coursework/src/data/.sqlx/query-063059de083c42956506d991bc04472929e6b2618ab13eb90e772ad9bd9c1984.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-063059de083c42956506d991bc04472929e6b2618ab13eb90e772ad9bd9c1984.json
rename to 3/coursework/src/data/.sqlx/query-063059de083c42956506d991bc04472929e6b2618ab13eb90e772ad9bd9c1984.json
diff --git a/3/coursework/src/database/.sqlx/query-0af939868e37bad5eb9097badeaefca62c247c4b2265a9667c4b33885126c771.json b/3/coursework/src/data/.sqlx/query-0af939868e37bad5eb9097badeaefca62c247c4b2265a9667c4b33885126c771.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-0af939868e37bad5eb9097badeaefca62c247c4b2265a9667c4b33885126c771.json
rename to 3/coursework/src/data/.sqlx/query-0af939868e37bad5eb9097badeaefca62c247c4b2265a9667c4b33885126c771.json
diff --git a/3/coursework/src/database/.sqlx/query-0bb7353d64231dc12416f5504d94513493670e3f2ae017d87a2f0c3eca045f60.json b/3/coursework/src/data/.sqlx/query-0bb7353d64231dc12416f5504d94513493670e3f2ae017d87a2f0c3eca045f60.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-0bb7353d64231dc12416f5504d94513493670e3f2ae017d87a2f0c3eca045f60.json
rename to 3/coursework/src/data/.sqlx/query-0bb7353d64231dc12416f5504d94513493670e3f2ae017d87a2f0c3eca045f60.json
diff --git a/3/coursework/src/database/.sqlx/query-346beb83d6351740a503b72133a190ac327ae79f6e555def8fec89fcc75fb015.json b/3/coursework/src/data/.sqlx/query-346beb83d6351740a503b72133a190ac327ae79f6e555def8fec89fcc75fb015.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-346beb83d6351740a503b72133a190ac327ae79f6e555def8fec89fcc75fb015.json
rename to 3/coursework/src/data/.sqlx/query-346beb83d6351740a503b72133a190ac327ae79f6e555def8fec89fcc75fb015.json
diff --git a/3/coursework/src/database/.sqlx/query-389e38e7e0a0b7d9ba667ac148a0a468da889a3455c47325938b819ab41ef4c8.json b/3/coursework/src/data/.sqlx/query-389e38e7e0a0b7d9ba667ac148a0a468da889a3455c47325938b819ab41ef4c8.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-389e38e7e0a0b7d9ba667ac148a0a468da889a3455c47325938b819ab41ef4c8.json
rename to 3/coursework/src/data/.sqlx/query-389e38e7e0a0b7d9ba667ac148a0a468da889a3455c47325938b819ab41ef4c8.json
diff --git a/3/coursework/src/database/.sqlx/query-404747d44ee859e8c967695c29963594bb8273e66c053934ec20d5fc3db9d41e.json b/3/coursework/src/data/.sqlx/query-404747d44ee859e8c967695c29963594bb8273e66c053934ec20d5fc3db9d41e.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-404747d44ee859e8c967695c29963594bb8273e66c053934ec20d5fc3db9d41e.json
rename to 3/coursework/src/data/.sqlx/query-404747d44ee859e8c967695c29963594bb8273e66c053934ec20d5fc3db9d41e.json
diff --git a/3/coursework/src/database/.sqlx/query-68ed36ae997fff190b4b15b80bf24b553d8ac922da251d9e8b8f4e897bab46b0.json b/3/coursework/src/data/.sqlx/query-68ed36ae997fff190b4b15b80bf24b553d8ac922da251d9e8b8f4e897bab46b0.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-68ed36ae997fff190b4b15b80bf24b553d8ac922da251d9e8b8f4e897bab46b0.json
rename to 3/coursework/src/data/.sqlx/query-68ed36ae997fff190b4b15b80bf24b553d8ac922da251d9e8b8f4e897bab46b0.json
diff --git a/3/coursework/src/database/.sqlx/query-695f4b0a4286cf625dc60dc3dfc4a9cd92aaea3ea58ef8702903983cfc32ab47.json b/3/coursework/src/data/.sqlx/query-695f4b0a4286cf625dc60dc3dfc4a9cd92aaea3ea58ef8702903983cfc32ab47.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-695f4b0a4286cf625dc60dc3dfc4a9cd92aaea3ea58ef8702903983cfc32ab47.json
rename to 3/coursework/src/data/.sqlx/query-695f4b0a4286cf625dc60dc3dfc4a9cd92aaea3ea58ef8702903983cfc32ab47.json
diff --git a/3/coursework/src/database/.sqlx/query-7cc4cf73572c0830d1da7b8e621a79a09f3e3d8cfd42d3946bd1fac93838b913.json b/3/coursework/src/data/.sqlx/query-7cc4cf73572c0830d1da7b8e621a79a09f3e3d8cfd42d3946bd1fac93838b913.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-7cc4cf73572c0830d1da7b8e621a79a09f3e3d8cfd42d3946bd1fac93838b913.json
rename to 3/coursework/src/data/.sqlx/query-7cc4cf73572c0830d1da7b8e621a79a09f3e3d8cfd42d3946bd1fac93838b913.json
diff --git a/3/coursework/src/database/.sqlx/query-7f06016e9892486c938a5e94c9e5f70903a38ed314235712c28ac5e14d9ac20f.json b/3/coursework/src/data/.sqlx/query-7f06016e9892486c938a5e94c9e5f70903a38ed314235712c28ac5e14d9ac20f.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-7f06016e9892486c938a5e94c9e5f70903a38ed314235712c28ac5e14d9ac20f.json
rename to 3/coursework/src/data/.sqlx/query-7f06016e9892486c938a5e94c9e5f70903a38ed314235712c28ac5e14d9ac20f.json
diff --git a/3/coursework/src/database/.sqlx/query-839cea68f9de889f35a0d0ad0b48b4a0dc1af49f0f0e7bb12238d22a9c37fbbc.json b/3/coursework/src/data/.sqlx/query-839cea68f9de889f35a0d0ad0b48b4a0dc1af49f0f0e7bb12238d22a9c37fbbc.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-839cea68f9de889f35a0d0ad0b48b4a0dc1af49f0f0e7bb12238d22a9c37fbbc.json
rename to 3/coursework/src/data/.sqlx/query-839cea68f9de889f35a0d0ad0b48b4a0dc1af49f0f0e7bb12238d22a9c37fbbc.json
diff --git a/3/coursework/src/database/.sqlx/query-8af7a0169e934cb82997a1cab04e921f719ed9466c13713fda8736c540d0fa78.json b/3/coursework/src/data/.sqlx/query-8af7a0169e934cb82997a1cab04e921f719ed9466c13713fda8736c540d0fa78.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-8af7a0169e934cb82997a1cab04e921f719ed9466c13713fda8736c540d0fa78.json
rename to 3/coursework/src/data/.sqlx/query-8af7a0169e934cb82997a1cab04e921f719ed9466c13713fda8736c540d0fa78.json
diff --git a/3/coursework/src/database/.sqlx/query-8be76176b46f645095dce3bcbed11134ec0f43504d3a820698282848fd67dbad.json b/3/coursework/src/data/.sqlx/query-8be76176b46f645095dce3bcbed11134ec0f43504d3a820698282848fd67dbad.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-8be76176b46f645095dce3bcbed11134ec0f43504d3a820698282848fd67dbad.json
rename to 3/coursework/src/data/.sqlx/query-8be76176b46f645095dce3bcbed11134ec0f43504d3a820698282848fd67dbad.json
diff --git a/3/coursework/src/database/.sqlx/query-8bfaca937858ed1060da5a650f749849d29af3d6345d0e02474abf4d8c78b89d.json b/3/coursework/src/data/.sqlx/query-8bfaca937858ed1060da5a650f749849d29af3d6345d0e02474abf4d8c78b89d.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-8bfaca937858ed1060da5a650f749849d29af3d6345d0e02474abf4d8c78b89d.json
rename to 3/coursework/src/data/.sqlx/query-8bfaca937858ed1060da5a650f749849d29af3d6345d0e02474abf4d8c78b89d.json
diff --git a/3/coursework/src/database/.sqlx/query-8e3ffe0d11d3eb38cd805771cd133588c0679404a68a8041f414553226abeeb2.json b/3/coursework/src/data/.sqlx/query-8e3ffe0d11d3eb38cd805771cd133588c0679404a68a8041f414553226abeeb2.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-8e3ffe0d11d3eb38cd805771cd133588c0679404a68a8041f414553226abeeb2.json
rename to 3/coursework/src/data/.sqlx/query-8e3ffe0d11d3eb38cd805771cd133588c0679404a68a8041f414553226abeeb2.json
diff --git a/3/coursework/src/database/.sqlx/query-93ec7d124c9bfa7329478d975614db874788ed297fe2d95275592becb186f942.json b/3/coursework/src/data/.sqlx/query-93ec7d124c9bfa7329478d975614db874788ed297fe2d95275592becb186f942.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-93ec7d124c9bfa7329478d975614db874788ed297fe2d95275592becb186f942.json
rename to 3/coursework/src/data/.sqlx/query-93ec7d124c9bfa7329478d975614db874788ed297fe2d95275592becb186f942.json
diff --git a/3/coursework/src/database/.sqlx/query-944eb40633e943a75244dee639fe6efb16919aff7172189c81240cb12462ae58.json b/3/coursework/src/data/.sqlx/query-944eb40633e943a75244dee639fe6efb16919aff7172189c81240cb12462ae58.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-944eb40633e943a75244dee639fe6efb16919aff7172189c81240cb12462ae58.json
rename to 3/coursework/src/data/.sqlx/query-944eb40633e943a75244dee639fe6efb16919aff7172189c81240cb12462ae58.json
diff --git a/3/coursework/src/database/.sqlx/query-9be7f66630e64787e55946dff428d28035747b66e57260bc9cd4634a71a037a6.json b/3/coursework/src/data/.sqlx/query-9be7f66630e64787e55946dff428d28035747b66e57260bc9cd4634a71a037a6.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-9be7f66630e64787e55946dff428d28035747b66e57260bc9cd4634a71a037a6.json
rename to 3/coursework/src/data/.sqlx/query-9be7f66630e64787e55946dff428d28035747b66e57260bc9cd4634a71a037a6.json
diff --git a/3/coursework/src/database/.sqlx/query-9fa86328c40ce0469f755efb4876010092b7bc9f240a5d43dc69f9d0b1b5b7ce.json b/3/coursework/src/data/.sqlx/query-9fa86328c40ce0469f755efb4876010092b7bc9f240a5d43dc69f9d0b1b5b7ce.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-9fa86328c40ce0469f755efb4876010092b7bc9f240a5d43dc69f9d0b1b5b7ce.json
rename to 3/coursework/src/data/.sqlx/query-9fa86328c40ce0469f755efb4876010092b7bc9f240a5d43dc69f9d0b1b5b7ce.json
diff --git a/3/coursework/src/database/.sqlx/query-b5814b93236d587957a103e61726b0b9ae811ba6bff0617871e76de3ef0ff662.json b/3/coursework/src/data/.sqlx/query-b5814b93236d587957a103e61726b0b9ae811ba6bff0617871e76de3ef0ff662.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-b5814b93236d587957a103e61726b0b9ae811ba6bff0617871e76de3ef0ff662.json
rename to 3/coursework/src/data/.sqlx/query-b5814b93236d587957a103e61726b0b9ae811ba6bff0617871e76de3ef0ff662.json
diff --git a/3/coursework/src/database/.sqlx/query-c1abf048d65d421717f20343bb0ef4fcd78f8571cfe2347c147124763bd17491.json b/3/coursework/src/data/.sqlx/query-c1abf048d65d421717f20343bb0ef4fcd78f8571cfe2347c147124763bd17491.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-c1abf048d65d421717f20343bb0ef4fcd78f8571cfe2347c147124763bd17491.json
rename to 3/coursework/src/data/.sqlx/query-c1abf048d65d421717f20343bb0ef4fcd78f8571cfe2347c147124763bd17491.json
diff --git a/3/coursework/src/database/.sqlx/query-c2b00adbcb3c35a6ffa6b2bce08a738a9b3cd1ca4aa4c843909c7e14f7ef3e06.json b/3/coursework/src/data/.sqlx/query-c2b00adbcb3c35a6ffa6b2bce08a738a9b3cd1ca4aa4c843909c7e14f7ef3e06.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-c2b00adbcb3c35a6ffa6b2bce08a738a9b3cd1ca4aa4c843909c7e14f7ef3e06.json
rename to 3/coursework/src/data/.sqlx/query-c2b00adbcb3c35a6ffa6b2bce08a738a9b3cd1ca4aa4c843909c7e14f7ef3e06.json
diff --git a/3/coursework/src/database/.sqlx/query-c8de918b432ce82bc7bf1d09a378f9b092d74c2298ac126f7edbb7d59c536910.json b/3/coursework/src/data/.sqlx/query-c8de918b432ce82bc7bf1d09a378f9b092d74c2298ac126f7edbb7d59c536910.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-c8de918b432ce82bc7bf1d09a378f9b092d74c2298ac126f7edbb7d59c536910.json
rename to 3/coursework/src/data/.sqlx/query-c8de918b432ce82bc7bf1d09a378f9b092d74c2298ac126f7edbb7d59c536910.json
diff --git a/3/coursework/src/database/.sqlx/query-cc8f7e13c6aedf6aa4d6d4fc39db7aa98b84baf911e7f779641c1dc514c676cd.json b/3/coursework/src/data/.sqlx/query-cc8f7e13c6aedf6aa4d6d4fc39db7aa98b84baf911e7f779641c1dc514c676cd.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-cc8f7e13c6aedf6aa4d6d4fc39db7aa98b84baf911e7f779641c1dc514c676cd.json
rename to 3/coursework/src/data/.sqlx/query-cc8f7e13c6aedf6aa4d6d4fc39db7aa98b84baf911e7f779641c1dc514c676cd.json
diff --git a/3/coursework/src/database/.sqlx/query-cf79e2f6038dddd055d535d2c41dd8dccd1a4e6a763963590c904c25abf33137.json b/3/coursework/src/data/.sqlx/query-cf79e2f6038dddd055d535d2c41dd8dccd1a4e6a763963590c904c25abf33137.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-cf79e2f6038dddd055d535d2c41dd8dccd1a4e6a763963590c904c25abf33137.json
rename to 3/coursework/src/data/.sqlx/query-cf79e2f6038dddd055d535d2c41dd8dccd1a4e6a763963590c904c25abf33137.json
diff --git a/3/coursework/src/database/.sqlx/query-d289747c7c7fba86e2b66174e2d1546f10e8213d36b6b3cd25016f829e9d731b.json b/3/coursework/src/data/.sqlx/query-d289747c7c7fba86e2b66174e2d1546f10e8213d36b6b3cd25016f829e9d731b.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-d289747c7c7fba86e2b66174e2d1546f10e8213d36b6b3cd25016f829e9d731b.json
rename to 3/coursework/src/data/.sqlx/query-d289747c7c7fba86e2b66174e2d1546f10e8213d36b6b3cd25016f829e9d731b.json
diff --git a/3/coursework/src/database/.sqlx/query-d474dd848d0ef8832afd4d1302fa562a3c4a4569032e8636d664043b5dc96661.json b/3/coursework/src/data/.sqlx/query-d474dd848d0ef8832afd4d1302fa562a3c4a4569032e8636d664043b5dc96661.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-d474dd848d0ef8832afd4d1302fa562a3c4a4569032e8636d664043b5dc96661.json
rename to 3/coursework/src/data/.sqlx/query-d474dd848d0ef8832afd4d1302fa562a3c4a4569032e8636d664043b5dc96661.json
diff --git a/3/coursework/src/database/.sqlx/query-daf98e6f1013c4993f7329f6fa690e92bccd89d1ff90131719c40626088dabd1.json b/3/coursework/src/data/.sqlx/query-daf98e6f1013c4993f7329f6fa690e92bccd89d1ff90131719c40626088dabd1.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-daf98e6f1013c4993f7329f6fa690e92bccd89d1ff90131719c40626088dabd1.json
rename to 3/coursework/src/data/.sqlx/query-daf98e6f1013c4993f7329f6fa690e92bccd89d1ff90131719c40626088dabd1.json
diff --git a/3/coursework/src/database/.sqlx/query-dfc2574c39f3f5a9afc1bdb642d8bf8a5ce85e7f84fa0dadb53c88cce63e5634.json b/3/coursework/src/data/.sqlx/query-dfc2574c39f3f5a9afc1bdb642d8bf8a5ce85e7f84fa0dadb53c88cce63e5634.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-dfc2574c39f3f5a9afc1bdb642d8bf8a5ce85e7f84fa0dadb53c88cce63e5634.json
rename to 3/coursework/src/data/.sqlx/query-dfc2574c39f3f5a9afc1bdb642d8bf8a5ce85e7f84fa0dadb53c88cce63e5634.json
diff --git a/3/coursework/src/database/.sqlx/query-e8ee44281a87c6e7147332dd5548971cb804a1ab1edcdae8bf009ac39059c2bb.json b/3/coursework/src/data/.sqlx/query-e8ee44281a87c6e7147332dd5548971cb804a1ab1edcdae8bf009ac39059c2bb.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-e8ee44281a87c6e7147332dd5548971cb804a1ab1edcdae8bf009ac39059c2bb.json
rename to 3/coursework/src/data/.sqlx/query-e8ee44281a87c6e7147332dd5548971cb804a1ab1edcdae8bf009ac39059c2bb.json
diff --git a/3/coursework/src/database/.sqlx/query-f4963ad77bcbc0af4fc929f1f66b7ee842c26c44da32ae9bbbc06c466a908ccf.json b/3/coursework/src/data/.sqlx/query-f4963ad77bcbc0af4fc929f1f66b7ee842c26c44da32ae9bbbc06c466a908ccf.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-f4963ad77bcbc0af4fc929f1f66b7ee842c26c44da32ae9bbbc06c466a908ccf.json
rename to 3/coursework/src/data/.sqlx/query-f4963ad77bcbc0af4fc929f1f66b7ee842c26c44da32ae9bbbc06c466a908ccf.json
diff --git a/3/coursework/src/database/.sqlx/query-f656bd1abb82c10af4e0e21b4a04a364988f5329356282f2ae0098dbfcaec671.json b/3/coursework/src/data/.sqlx/query-f656bd1abb82c10af4e0e21b4a04a364988f5329356282f2ae0098dbfcaec671.json
similarity index 100%
rename from 3/coursework/src/database/.sqlx/query-f656bd1abb82c10af4e0e21b4a04a364988f5329356282f2ae0098dbfcaec671.json
rename to 3/coursework/src/data/.sqlx/query-f656bd1abb82c10af4e0e21b4a04a364988f5329356282f2ae0098dbfcaec671.json
diff --git a/3/coursework/src/database/Cargo.toml b/3/coursework/src/data/Cargo.toml
similarity index 96%
rename from 3/coursework/src/database/Cargo.toml
rename to 3/coursework/src/data/Cargo.toml
index 0ed9ab6..432c9e2 100644
--- a/3/coursework/src/database/Cargo.toml
+++ b/3/coursework/src/data/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "database"
+name = "data"
 version = "0.1.0"
 edition = "2024"
 
diff --git a/3/coursework/src/data/src/adapter.rs b/3/coursework/src/data/src/adapter.rs
new file mode 100644
index 0000000..37f698b
--- /dev/null
+++ b/3/coursework/src/data/src/adapter.rs
@@ -0,0 +1,2 @@
+//! Specific implementations of [`crate::port`]s to plug into other parts of the application.
+pub mod mysql;
diff --git a/3/coursework/src/database/src/adapter/mysql.rs b/3/coursework/src/data/src/adapter/mysql.rs
similarity index 67%
rename from 3/coursework/src/database/src/adapter/mysql.rs
rename to 3/coursework/src/data/src/adapter/mysql.rs
index ec9df17..9d6db43 100644
--- a/3/coursework/src/database/src/adapter/mysql.rs
+++ b/3/coursework/src/data/src/adapter/mysql.rs
@@ -1,3 +1,4 @@
+//! `MySQL` adapters.
 pub mod base;
 pub mod package;
 pub mod user;
diff --git a/3/coursework/src/database/src/adapter/mysql/base.rs b/3/coursework/src/data/src/adapter/mysql/base.rs
similarity index 96%
rename from 3/coursework/src/database/src/adapter/mysql/base.rs
rename to 3/coursework/src/data/src/adapter/mysql/base.rs
index 02d358e..6d9fa8d 100644
--- a/3/coursework/src/database/src/adapter/mysql/base.rs
+++ b/3/coursework/src/data/src/adapter/mysql/base.rs
@@ -1,5 +1,7 @@
-pub use crate::port::base::*;
+use crate::Result;
+use crate::port::base::{Base, BaseRepository, Field, New};
 
+use chrono::Utc;
 use sqlx::{Executor, MySql};
 
 pub struct BaseAdapter;
diff --git a/3/coursework/src/database/src/adapter/mysql/package.rs b/3/coursework/src/data/src/adapter/mysql/package.rs
similarity index 97%
rename from 3/coursework/src/database/src/adapter/mysql/package.rs
rename to 3/coursework/src/data/src/adapter/mysql/package.rs
index 9819f30..b1286d1 100644
--- a/3/coursework/src/database/src/adapter/mysql/package.rs
+++ b/3/coursework/src/data/src/adapter/mysql/package.rs
@@ -1,5 +1,7 @@
-pub use crate::port::package::*;
+use crate::Result;
+use crate::port::package::{Field, New, Package, PackageRepository, Unique};
 
+use chrono::Utc;
 use sqlx::{Executor, MySql};
 
 pub struct PackageAdapter;
diff --git a/3/coursework/src/database/src/adapter/mysql/user.rs b/3/coursework/src/data/src/adapter/mysql/user.rs
similarity index 97%
rename from 3/coursework/src/database/src/adapter/mysql/user.rs
rename to 3/coursework/src/data/src/adapter/mysql/user.rs
index 9c06555..ca66177 100644
--- a/3/coursework/src/database/src/adapter/mysql/user.rs
+++ b/3/coursework/src/data/src/adapter/mysql/user.rs
@@ -1,5 +1,7 @@
-pub use crate::port::user::*;
+use crate::Result;
+use crate::port::user::{Field, New, Unique, User, UserRepository};
 
+use chrono::Utc;
 use sqlx::{Executor, MySql};
 
 pub struct UserAdapter;
diff --git a/3/coursework/src/database/src/atomic.rs b/3/coursework/src/data/src/atomic.rs
similarity index 79%
rename from 3/coursework/src/database/src/atomic.rs
rename to 3/coursework/src/data/src/atomic.rs
index cfb5cfe..1141e7d 100644
--- a/3/coursework/src/database/src/atomic.rs
+++ b/3/coursework/src/data/src/atomic.rs
@@ -1,11 +1,15 @@
-type Result<T = ()> = std::result::Result<T, Box<dyn std::error::Error>>;
+//! Unify transaction management for established connections.
+use crate::Result;
 
 pub trait Atomic {
     type Transaction<'a>;
 
     fn start_transaction(&mut self) -> impl Future<Output = Result<Self::Transaction<'_>>> + Send;
-    fn abort_transaction(transaction: Self::Transaction<'_>) -> impl Future<Output = Result> + Send;
-    fn commit_transaction(transaction: Self::Transaction<'_>) -> impl Future<Output = Result> + Send;
+    fn abort_transaction(transaction: Self::Transaction<'_>)
+    -> impl Future<Output = Result> + Send;
+    fn commit_transaction(
+        transaction: Self::Transaction<'_>,
+    ) -> impl Future<Output = Result> + Send;
 }
 
 use sqlx::Connection;
diff --git a/3/coursework/src/database/src/connect.rs b/3/coursework/src/data/src/connect.rs
similarity index 60%
rename from 3/coursework/src/database/src/connect.rs
rename to 3/coursework/src/data/src/connect.rs
index 9c4ecb5..f8e054b 100644
--- a/3/coursework/src/database/src/connect.rs
+++ b/3/coursework/src/data/src/connect.rs
@@ -1,4 +1,5 @@
-type Result<T = ()> = std::result::Result<T, Box<dyn std::error::Error>>;
+//! Driver to manage a connection which is passed to adapters.
+use crate::Result;
 
 pub trait Connect {
     type Connection;
@@ -8,13 +9,20 @@ pub trait Connect {
 }
 
 use sqlx::Connection;
+pub use sqlx::MySqlConnection as SqlxConnection;
+pub use sqlx::MySqlPool as SqlxPool;
 
 #[derive(Clone)]
 pub struct MySqlPool {
-    pool: sqlx::MySqlPool,
+    pool: SqlxPool,
+}
+impl MySqlPool {
+    pub const fn new(pool: SqlxPool) -> Self {
+        Self { pool }
+    }
 }
 impl Connect for MySqlPool {
-    type Connection = sqlx::MySqlPool;
+    type Connection = SqlxPool;
 
     async fn open_connection(&self) -> Result<Self::Connection> {
         Ok(self.pool.clone())
@@ -27,14 +35,16 @@ impl Connect for MySqlPool {
 pub struct MySqlConnection {
     link: String,
 }
-
+impl MySqlConnection {
+    pub const fn new(link: String) -> Self {
+        Self { link }
+    }
+}
 impl Connect for MySqlConnection {
-    type Connection = sqlx::MySqlConnection;
+    type Connection = SqlxConnection;
 
     async fn open_connection(&self) -> Result<Self::Connection> {
-        sqlx::MySqlConnection::connect(&self.link)
-            .await
-            .map_err(Box::from)
+        SqlxConnection::connect(&self.link).await.map_err(Box::from)
     }
     async fn close_connection(connection: Self::Connection) -> Result {
         connection.close().await?;
diff --git a/3/coursework/src/data/src/lib.rs b/3/coursework/src/data/src/lib.rs
new file mode 100644
index 0000000..8633dbc
--- /dev/null
+++ b/3/coursework/src/data/src/lib.rs
@@ -0,0 +1,21 @@
+//! Data access for the application.
+pub mod adapter;
+pub mod atomic;
+pub mod connect;
+pub mod port;
+
+// Don't want to handle errors for dynamic mess.
+pub type BoxDynError = Box<dyn std::error::Error + Send + Sync + 'static>;
+pub type Result<T = (), E = BoxDynError> = std::result::Result<T, E>;
+
+pub use chrono::Utc;
+
+pub use atomic::Atomic;
+pub use connect::*;
+
+pub use adapter::mysql::base::BaseAdapter as MySqlBaseAdapter;
+pub use adapter::mysql::package::PackageAdapter as MySqlPackageAdapter;
+pub use adapter::mysql::user::UserAdapter as MySqlUserAdapter;
+pub use port::base::{self, Base, BaseRepository};
+pub use port::package::{self, Package, PackageRepository};
+pub use port::user::{self, User, UserRepository};
diff --git a/3/coursework/src/database/src/port.rs b/3/coursework/src/data/src/port.rs
similarity index 67%
rename from 3/coursework/src/database/src/port.rs
rename to 3/coursework/src/data/src/port.rs
index 5daecd5..a9b70f4 100644
--- a/3/coursework/src/database/src/port.rs
+++ b/3/coursework/src/data/src/port.rs
@@ -1,4 +1,11 @@
-pub type Result<T = (), E = Box<dyn std::error::Error>> = std::result::Result<T, E>;
+//! Low-level repository traits for unified data access.
+//!
+//! No data validation besides very basic one like length violation.
+use crate::Result;
+
+pub mod base;
+pub mod package;
+pub mod user;
 
 pub trait CRUD<C> {
     type New;
@@ -9,17 +16,18 @@ pub trait CRUD<C> {
     fn create(
         connection: &mut C,
         data: Self::New,
-    ) -> impl Future<Output = Result<Self::Existing>> + Send;
+    ) -> impl Future<Output = crate::Result<Self::Existing>> + Send;
     fn read(
         connection: &C,
         data: Self::Unique,
-    ) -> impl Future<Output = Result<Option<Self::Existing>>> + Send;
+    ) -> impl Future<Output = crate::Result<Option<Self::Existing>>> + Send;
     fn update(
         connection: &mut C,
         existing: &mut Self::Existing,
         data: Self::Update,
-    ) -> impl Future<Output = Result> + Send;
-    fn delete(connection: &mut C, data: Self::Unique) -> impl Future<Output = Result> + Send;
+    ) -> impl Future<Output = crate::Result> + Send;
+    fn delete(connection: &mut C, data: Self::Unique)
+    -> impl Future<Output = crate::Result> + Send;
 }
 
 trait CharLength {
@@ -48,9 +56,3 @@ trait MaxLength {
         }
     }
 }
-
-// const TOO_LONG: &str = "too long";
-
-pub mod base;
-pub mod package;
-pub mod user;
diff --git a/3/coursework/src/database/src/port/base.rs b/3/coursework/src/data/src/port/base.rs
similarity index 85%
rename from 3/coursework/src/database/src/port/base.rs
rename to 3/coursework/src/data/src/port/base.rs
index c312733..d7c72fe 100644
--- a/3/coursework/src/database/src/port/base.rs
+++ b/3/coursework/src/data/src/port/base.rs
@@ -1,11 +1,10 @@
 use super::MaxLength;
-pub use super::{CRUD, Result};
 
-pub use chrono::{DateTime, Utc};
+use chrono::{DateTime, Utc};
 use derive_more::{Deref, Into};
 
 pub trait BaseRepository<C>:
-    CRUD<C, New = New, Unique = u64, Update = Field, Existing = Base>
+    super::CRUD<C, New = New, Unique = u64, Update = Field, Existing = Base>
 {
 }
 
@@ -34,11 +33,13 @@ impl MaxLength for Description {
     const MAX_LENGTH: usize = 510;
 }
 impl TryFrom<Option<String>> for Description {
-    type Error = &'static str;
+    type Error = (Option<String>, &'static str);
 
     fn try_from(value: Option<String>) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
diff --git a/3/coursework/src/database/src/port/package.rs b/3/coursework/src/data/src/port/package.rs
similarity index 76%
rename from 3/coursework/src/database/src/port/package.rs
rename to 3/coursework/src/data/src/port/package.rs
index 7d4029b..6d7862e 100644
--- a/3/coursework/src/database/src/port/package.rs
+++ b/3/coursework/src/data/src/port/package.rs
@@ -1,11 +1,11 @@
 use super::MaxLength;
-pub use super::{CRUD, Result, base::Base};
+use crate::Base;
 
-pub use chrono::{DateTime, Utc};
+use chrono::{DateTime, Utc};
 use derive_more::{Deref, Into};
 
 pub trait PackageRepository<C>:
-    CRUD<C, New = New, Update = Field, Unique = Unique, Existing = Package>
+    super::CRUD<C, New = New, Update = Field, Unique = Unique, Existing = Package>
 {
 }
 
@@ -16,11 +16,13 @@ impl MaxLength for Name {
     const MAX_LENGTH: usize = 127;
 }
 impl TryFrom<String> for Name {
-    type Error = &'static str;
+    type Error = (String, &'static str);
 
     fn try_from(value: String) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
@@ -31,11 +33,13 @@ impl MaxLength for Version {
     const MAX_LENGTH: usize = 127;
 }
 impl TryFrom<String> for Version {
-    type Error = &'static str;
+    type Error = (String, &'static str);
 
     fn try_from(value: String) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
@@ -46,11 +50,13 @@ impl MaxLength for Description {
     const MAX_LENGTH: usize = 255;
 }
 impl TryFrom<Option<String>> for Description {
-    type Error = &'static str;
+    type Error = (Option<String>, &'static str);
 
     fn try_from(value: Option<String>) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
@@ -61,11 +67,13 @@ impl MaxLength for URL {
     const MAX_LENGTH: usize = 510;
 }
 impl TryFrom<Option<String>> for URL {
-    type Error = &'static str;
+    type Error = (Option<String>, &'static str);
 
     fn try_from(value: Option<String>) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
diff --git a/3/coursework/src/database/src/port/user.rs b/3/coursework/src/data/src/port/user.rs
similarity index 76%
rename from 3/coursework/src/database/src/port/user.rs
rename to 3/coursework/src/data/src/port/user.rs
index fb49757..359ce02 100644
--- a/3/coursework/src/database/src/port/user.rs
+++ b/3/coursework/src/data/src/port/user.rs
@@ -1,11 +1,10 @@
 use super::MaxLength;
-pub use super::{CRUD, Result};
 
-pub use chrono::{DateTime, Utc};
+use chrono::{DateTime, Utc};
 use derive_more::{Deref, Into};
 
 pub trait UserRepository<C>:
-    CRUD<C, New = New, Update = Field, Unique = Unique, Existing = User>
+    super::CRUD<C, New = New, Update = Field, Unique = Unique, Existing = User>
 {
 }
 
@@ -16,11 +15,13 @@ impl MaxLength for Name {
     const MAX_LENGTH: usize = 31;
 }
 impl TryFrom<String> for Name {
-    type Error = &'static str;
+    type Error = (String, &'static str);
 
     fn try_from(value: String) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
@@ -31,11 +32,13 @@ impl MaxLength for Email {
     const MAX_LENGTH: usize = 255;
 }
 impl TryFrom<String> for Email {
-    type Error = &'static str;
+    type Error = (String, &'static str);
 
     fn try_from(value: String) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
@@ -46,11 +49,13 @@ impl MaxLength for Password {
     const MAX_LENGTH: usize = 255;
 }
 impl TryFrom<String> for Password {
-    type Error = &'static str;
+    type Error = (String, &'static str);
 
     fn try_from(value: String) -> Result<Self, Self::Error> {
-        Self::validate(&value)?;
-        Ok(Self(value))
+        match Self::validate(&value) {
+            Ok(()) => Ok(Self(value)),
+            Err(e) => Err((value, e)),
+        }
     }
 }
 
@@ -76,6 +81,7 @@ pub struct New {
     pub last_used: Option<DateTime<Utc>>,
 }
 
+#[derive(Debug)]
 pub struct User {
     pub(crate) id: u64,
     pub(crate) name: String,
diff --git a/3/coursework/src/database/src/adapter.rs b/3/coursework/src/database/src/adapter.rs
deleted file mode 100644
index 4fb2dd9..0000000
--- a/3/coursework/src/database/src/adapter.rs
+++ /dev/null
@@ -1 +0,0 @@
-pub mod mysql;
diff --git a/3/coursework/src/database/src/lib.rs b/3/coursework/src/database/src/lib.rs
deleted file mode 100644
index b66abeb..0000000
--- a/3/coursework/src/database/src/lib.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub mod adapter;
-pub mod atomic;
-pub mod connect;
-pub mod port;
diff --git a/3/coursework/src/app/authentication/Cargo.toml b/3/coursework/src/service/Cargo.toml
similarity index 79%
rename from 3/coursework/src/app/authentication/Cargo.toml
rename to 3/coursework/src/service/Cargo.toml
index 3fafecd..372db4c 100644
--- a/3/coursework/src/app/authentication/Cargo.toml
+++ b/3/coursework/src/service/Cargo.toml
@@ -1,14 +1,13 @@
 [package]
-name = "authentication"
+name = "service"
 version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-argon2 = { version = "0.5.3", features = ["std"] }
-
 thiserror = "2.0.11"
+argon2 = { version = "0.5.3", features = ["std"] }
 garde = { version = "0.22.0", features = ["email", "url", "derive"] }
 derive_more = { version = "1.0.0", features = ["deref", "deref_mut", "into"] }
 
-[dependencies.database]
-path = "../../database"
+[dependencies.data]
+path = "../data"
diff --git a/3/coursework/src/service/src/authentication.rs b/3/coursework/src/service/src/authentication.rs
new file mode 100644
index 0000000..142e065
--- /dev/null
+++ b/3/coursework/src/service/src/authentication.rs
@@ -0,0 +1,9 @@
+pub mod adapter;
+pub mod contract;
+pub mod repository;
+pub mod service;
+
+pub use adapter::*;
+pub use contract::*;
+pub use repository::*;
+pub use service::*;
diff --git a/3/coursework/src/app/authentication/src/repository.rs b/3/coursework/src/service/src/authentication/adapter.rs
similarity index 62%
rename from 3/coursework/src/app/authentication/src/repository.rs
rename to 3/coursework/src/service/src/authentication/adapter.rs
index 766731b..76173de 100644
--- a/3/coursework/src/app/authentication/src/repository.rs
+++ b/3/coursework/src/service/src/authentication/adapter.rs
@@ -1,33 +1,7 @@
-pub use database::port::user::*;
+use super::{Authenticated, AuthenticationRepository, Get};
+use data::user::{Field, New, User, UserRepository};
+use data::{Connect, Result};
 
-use derive_more::{Deref, DerefMut};
-
-#[derive(Deref, DerefMut)]
-pub struct Authenticated(User);
-
-pub trait AuthenticationRepository {
-    fn get_user(&self, get: Get) -> impl Future<Output = Result<Option<User>>> + Send;
-    fn create_user(&self, new: New) -> impl Future<Output = Result<User>> + Send;
-    fn start_session(&self, user: User) -> impl Future<Output = Result<Authenticated>> + Send;
-}
-
-pub enum Get {
-    Name(Name),
-    Email(Email),
-}
-
-impl From<Get> for Unique {
-    fn from(value: Get) -> Self {
-        match value {
-            Get::Name(s) => Self::Name(s),
-            Get::Email(s) => Self::Email(s),
-        }
-    }
-}
-
-// Adapter
-
-use database::connect::Connect;
 use std::marker::PhantomData;
 
 pub struct AuthenticationAdapter<D, C, UR>
@@ -78,7 +52,7 @@ where
 
     async fn start_session(&self, mut user: User) -> Result<Authenticated> {
         let mut c = self.driver.open_connection().await?;
-        UR::update(&mut c, &mut user, Field::LastUsed(Some(Utc::now()))).await?;
+        UR::update(&mut c, &mut user, Field::LastUsed(Some(data::Utc::now()))).await?;
         D::close_connection(c).await?;
 
         Ok(Authenticated(user))
diff --git a/3/coursework/src/service/src/authentication/contract.rs b/3/coursework/src/service/src/authentication/contract.rs
new file mode 100644
index 0000000..b226a68
--- /dev/null
+++ b/3/coursework/src/service/src/authentication/contract.rs
@@ -0,0 +1,122 @@
+use super::Authenticated;
+use data::user;
+
+use derive_more::{Deref, Into};
+use garde::Validate;
+
+pub type Result<T = (), E = Error> = std::result::Result<T, E>;
+
+pub trait AuthenticationContract {
+    fn name_available(&self, name: Name) -> impl Future<Output = Result> + Send;
+    fn email_available(&self, email: Email) -> impl Future<Output = Result> + Send;
+
+    fn login(&self, data: LoginData) -> impl Future<Output = Result<Authenticated>> + Send;
+    fn register(
+        &mut self,
+        data: RegisterData,
+    ) -> impl Future<Output = Result<Authenticated>> + Send;
+}
+
+pub struct LoginData {
+    pub login: Login,
+    pub password: Password,
+}
+
+pub struct RegisterData {
+    pub name: Name,
+    pub email: Email,
+    pub password: Password,
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    // Login
+    #[error("login was not found")]
+    LoginNotFound,
+    #[error("incorrect password")]
+    IncorrectPassword,
+    // Register
+    #[error("username is taken")]
+    NameExists,
+    #[error("email is already in use")]
+    EmailExists,
+    // Shared
+    #[error("invalid password: {0}")]
+    InvalidPassword(data::BoxDynError),
+    #[error("data source error: {0}")]
+    Repository(data::BoxDynError),
+}
+
+#[derive(Clone)]
+pub enum Login {
+    Name(Name),
+    Email(Email),
+}
+impl TryFrom<String> for Login {
+    type Error = (String, &'static str);
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        let value = match Email::try_from(value) {
+            Ok(x) => return Ok(Self::Email(x)),
+            Err((s, _)) => s,
+        };
+        match Name::try_from(value) {
+            Ok(x) => Ok(Self::Name(x)),
+            Err((s, _)) => Err((s, "login is invalid")),
+        }
+    }
+}
+
+#[derive(Clone, Deref, Into)]
+pub struct Name(user::Name);
+impl TryFrom<String> for Name {
+    type Error = (String, Box<dyn std::error::Error>);
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        #[derive(Validate)]
+        #[garde(transparent)]
+        struct Username<'a>(#[garde(alphanumeric, length(chars, min = 2, max = 31))] &'a str);
+
+        if let Err(e) = Username(&value).validate() {
+            return Err((value, e.into()));
+        }
+        match user::Name::try_from(value) {
+            Ok(x) => Ok(Self(x)),
+            Err((s, e)) => Err((s, e.into())),
+        }
+    }
+}
+
+#[derive(Clone, Deref, Into)]
+pub struct Email(user::Email);
+impl TryFrom<String> for Email {
+    type Error = (String, Box<dyn std::error::Error>);
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        #[derive(Validate)]
+        #[garde(transparent)]
+        pub struct Email<'a>(#[garde(email, length(chars, max = 255))] &'a str);
+
+        if let Err(e) = Email(&value).validate() {
+            return Err((value, e.into()));
+        }
+        match user::Email::try_from(value) {
+            Ok(x) => Ok(Self(x)),
+            Err((s, e)) => Err((s, e.into())),
+        }
+    }
+}
+
+#[derive(Clone, Deref, Into)]
+pub struct Password(String);
+impl TryFrom<String> for Password {
+    type Error = (String, &'static str);
+
+    fn try_from(value: String) -> Result<Self, Self::Error> {
+        if value.chars().count() >= 8 {
+            Ok(Self(value))
+        } else {
+            Err((value, "password must be 8 characters or more"))
+        }
+    }
+}
diff --git a/3/coursework/src/service/src/authentication/repository.rs b/3/coursework/src/service/src/authentication/repository.rs
new file mode 100644
index 0000000..aa7bca6
--- /dev/null
+++ b/3/coursework/src/service/src/authentication/repository.rs
@@ -0,0 +1,26 @@
+use data::Result;
+use data::user::{Email, Name, New, Unique, User};
+
+use derive_more::{Deref, DerefMut};
+
+#[derive(Deref, DerefMut, Debug)]
+pub struct Authenticated(pub(super) User);
+
+pub trait AuthenticationRepository {
+    fn get_user(&self, get: Get) -> impl Future<Output = Result<Option<User>>> + Send;
+    fn create_user(&self, new: New) -> impl Future<Output = Result<User>> + Send;
+    fn start_session(&self, user: User) -> impl Future<Output = Result<Authenticated>> + Send;
+}
+
+pub enum Get {
+    Name(Name),
+    Email(Email),
+}
+impl From<Get> for Unique {
+    fn from(value: Get) -> Self {
+        match value {
+            Get::Name(s) => Self::Name(s),
+            Get::Email(s) => Self::Email(s),
+        }
+    }
+}
diff --git a/3/coursework/src/service/src/authentication/service.rs b/3/coursework/src/service/src/authentication/service.rs
new file mode 100644
index 0000000..7df788d
--- /dev/null
+++ b/3/coursework/src/service/src/authentication/service.rs
@@ -0,0 +1,114 @@
+use super::{
+    Authenticated, AuthenticationContract, AuthenticationRepository, Email, Error, Get, Login,
+    LoginData, Name, RegisterData, Result,
+};
+
+use argon2::{
+    Argon2,
+    password_hash::{
+        self, PasswordHash, PasswordHasher, PasswordVerifier, SaltString, rand_core::OsRng,
+    },
+};
+
+impl From<password_hash::Error> for Error {
+    fn from(error: password_hash::Error) -> Self {
+        match error {
+            password_hash::Error::Password => Self::IncorrectPassword,
+            _ => Self::InvalidPassword(error.into()),
+        }
+    }
+}
+
+pub struct AuthenticationService<R>
+where
+    R: AuthenticationRepository,
+{
+    pub(crate) repository: R,
+}
+
+impl<R> AuthenticationService<R>
+where
+    R: AuthenticationRepository,
+{
+    pub const fn new(repository: R) -> Self {
+        Self { repository }
+    }
+}
+
+impl<R> AuthenticationContract for AuthenticationService<R>
+where
+    R: AuthenticationRepository + Send + Sync,
+{
+    async fn name_available(&self, name: Name) -> Result {
+        if self
+            .repository
+            .get_user(Get::Name(name.into()))
+            .await
+            .map_err(Error::Repository)?
+            .is_some()
+        {
+            return Err(Error::NameExists);
+        };
+        Ok(())
+    }
+    async fn email_available(&self, email: Email) -> Result {
+        if self
+            .repository
+            .get_user(Get::Email(email.into()))
+            .await
+            .map_err(Error::Repository)?
+            .is_some()
+        {
+            return Err(Error::EmailExists);
+        };
+        Ok(())
+    }
+
+    async fn login(&self, data: LoginData) -> Result<Authenticated> {
+        let user = match data.login {
+            Login::Name(name) => self.repository.get_user(Get::Name(name.into())),
+            Login::Email(email) => self.repository.get_user(Get::Email(email.into())),
+        }
+        .await
+        .map_err(Error::Repository)?
+        .ok_or(Error::LoginNotFound)?;
+
+        Argon2::default().verify_password(
+            data.password.as_bytes(),
+            &PasswordHash::new(user.password())?,
+        )?;
+
+        self.repository
+            .start_session(user)
+            .await
+            .map_err(Error::Repository)
+    }
+
+    async fn register(&mut self, data: RegisterData) -> Result<Authenticated> {
+        self.name_available(data.name.clone()).await?;
+        self.email_available(data.email.clone()).await?;
+
+        // Get PHC string ($argon2id$v=19$...)
+        let password = Argon2::default()
+            .hash_password(data.password.as_bytes(), &SaltString::generate(&mut OsRng))?
+            .to_string()
+            .try_into()
+            .map_err(|(_, e)| Error::InvalidPassword(Box::from(e)))?;
+
+        let user = self
+            .repository
+            .create_user(data::user::New {
+                name: data.name.into(),
+                email: data.email.into(),
+                password,
+                last_used: None,
+            })
+            .await
+            .map_err(Error::Repository)?;
+
+        self.repository
+            .start_session(user)
+            .await
+            .map_err(Error::Repository)
+    }
+}
diff --git a/3/coursework/src/service/src/lib.rs b/3/coursework/src/service/src/lib.rs
new file mode 100644
index 0000000..997a1fd
--- /dev/null
+++ b/3/coursework/src/service/src/lib.rs
@@ -0,0 +1,6 @@
+pub mod authentication;
+
+pub use authentication::{
+    Authenticated, AuthenticationAdapter, AuthenticationContract, AuthenticationRepository,
+    AuthenticationService,
+};
diff --git a/3/coursework/src/view/Cargo.toml b/3/coursework/src/view/Cargo.toml
new file mode 100644
index 0000000..b558b15
--- /dev/null
+++ b/3/coursework/src/view/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "view"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+iced = { version = "0.13.1", features = ["lazy", "tokio"] }
diff --git a/3/coursework/src/view/src/authentication.rs b/3/coursework/src/view/src/authentication.rs
new file mode 100644
index 0000000..f5685a3
--- /dev/null
+++ b/3/coursework/src/view/src/authentication.rs
@@ -0,0 +1,104 @@
+pub mod login;
+pub mod register;
+
+use crate::input::Validation;
+
+use iced::Task;
+
+pub struct Authentication {
+    screen: Screen,
+    login: login::Login,
+    register: register::Register,
+}
+pub enum Screen {
+    Login,
+    Register,
+}
+
+#[derive(Debug)]
+pub enum Message {
+    Login(login::Message),
+    Register(register::Message),
+}
+
+pub enum Request {
+    Task(Task<Message>),
+    SimpleLoginValidation(login::Field),
+    SimpleRegisterValidation(register::Field),
+    Login {
+        login: String,
+        password: String,
+    },
+    Register {
+        name: String,
+        email: String,
+        password: String,
+    },
+}
+
+pub enum RequestResult {
+    Error(String),
+    LoginValidation(login::Field, Validation),
+    RegisterValidation(register::Field, Validation),
+}
+
+impl Default for Authentication {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Authentication {
+    pub const fn new() -> Self {
+        Self {
+            screen: Screen::Login,
+            login: Login::new(),
+            register: Register::new(),
+        }
+    }
+
+    pub fn update(&mut self, message: Message) -> Option<Request> {
+        Some(match message {
+            Message::Login(message) => match self.login.update(message)? {
+                login::Request::SwitchToRegister => {
+                    self.screen = Screen::Register;
+                    return None;
+                }
+                login::Request::SimpleValidation(x) => Request::SimpleLoginValidation(x),
+                login::Request::Task(task) => Request::Task(task.map(Message::Login)),
+                login::Request::Login { login, password } => Request::Login { login, password },
+            },
+            Message::Register(message) => match self.register.update(message)? {
+                register::Request::SwitchToLogin => {
+                    self.screen = Screen::Login;
+                    return None;
+                }
+                register::Request::SimpleValidation(x) => Request::SimpleRegisterValidation(x),
+                register::Request::Task(task) => Request::Task(task.map(Message::Register)),
+                register::Request::Register {
+                    name,
+                    email,
+                    password,
+                } => Request::Register {
+                    name,
+                    email,
+                    password,
+                },
+            },
+        })
+    }
+
+    pub fn view(&self) -> iced::Element<Message> {
+        match self.screen {
+            Screen::Login => self.login.view().map(Message::Login),
+            Screen::Register => self.register.view().map(Message::Register),
+        }
+    }
+
+    pub fn title(&self) -> std::borrow::Cow<str> {
+        match self.screen {
+            Screen::Login => self.login.title(),
+            Screen::Register => self.register.title(),
+        }
+    }
+}
diff --git a/3/coursework/src/view/src/authentication/login.rs b/3/coursework/src/view/src/authentication/login.rs
new file mode 100644
index 0000000..d0f2e3b
--- /dev/null
+++ b/3/coursework/src/view/src/authentication/login.rs
@@ -0,0 +1,164 @@
+use crate::input::{Input, Validation};
+use crate::widget::centerbox;
+
+use iced::widget::{Space, button, checkbox, column, container, row, text};
+use iced::{Length, Task, padding};
+
+pub struct Login {
+    state: State,
+    login: Input,
+    password: Input,
+    show_password: bool,
+}
+enum State {
+    None,
+    Requesting,
+    Error(String),
+}
+
+pub enum Request {
+    SwitchToRegister,
+    SimpleValidation(Field),
+    Task(Task<Message>),
+    Login { login: String, password: String },
+}
+pub enum Field {
+    Login(String),
+    Password(String),
+}
+
+pub enum RequestResult {
+    Error(String),
+    Validation(Field, Validation),
+}
+
+#[derive(Debug, Clone)]
+pub enum Message {
+    LoginChanged(String),
+    PasswordChanged(String),
+    ShowPasswordToggled(bool),
+
+    LoginSubmitted,
+    PasswordSubmitted,
+
+    LoginPressed,
+    RegisterPressed,
+}
+
+impl Default for Login {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Login {
+    pub const fn new() -> Self {
+        Self {
+            state: State::None,
+            login: Input::new("login_name"),
+            password: Input::new("login_password"),
+            show_password: false,
+        }
+    }
+
+    pub fn handle_result(&mut self, result: RequestResult) {
+        match result {
+            RequestResult::Error(e) => self.state = State::Error(e),
+            RequestResult::Validation(field, validation) => match &field {
+                Field::Login(s) => self.login.apply_if_eq(s, validation),
+                Field::Password(s) => self.password.apply_if_eq(s, validation),
+            },
+        }
+    }
+
+    pub fn update(&mut self, message: Message) -> Option<Request> {
+        Some(match message {
+            Message::LoginChanged(s) => {
+                self.login.update(s.clone());
+                Request::SimpleValidation(Field::Login(s))
+            }
+            Message::PasswordChanged(s) => {
+                self.password.update(s.clone());
+                Request::SimpleValidation(Field::Password(s))
+            }
+
+            Message::ShowPasswordToggled(b) => {
+                self.show_password = b;
+                return None;
+            }
+
+            Message::LoginSubmitted if !self.login.submittable() => return None,
+            Message::LoginSubmitted => Request::Task(self.login.focus()),
+
+            Message::LoginPressed | Message::PasswordSubmitted => {
+                if !self.login.submittable() {
+                    Request::Task(self.login.focus())
+                } else if !self.password.submittable() {
+                    Request::Task(self.password.focus())
+                } else {
+                    self.state = State::Requesting;
+
+                    Request::Login {
+                        login: self.login.value().into(),
+                        password: self.password.value().into(),
+                    }
+                }
+            }
+
+            Message::RegisterPressed => Request::SwitchToRegister,
+        })
+    }
+
+    pub fn view(&self) -> iced::Element<Message> {
+        centerbox(
+            column![
+                container(text(self.title()).size(20))
+                    .center_x(Length::Fill)
+                    .padding(padding::bottom(10)),
+                self.login
+                    .view("Email or Username")
+                    .on_input(Message::LoginChanged)
+                    .on_submit(Message::LoginSubmitted),
+                self.password
+                    .view("Password")
+                    .on_input(Message::PasswordChanged)
+                    .on_submit(Message::PasswordSubmitted)
+                    .secure(!self.show_password),
+                checkbox("Show password", self.show_password)
+                    .on_toggle(Message::ShowPasswordToggled),
+                row![
+                    button(text("Register").center().size(18))
+                        .on_press(Message::RegisterPressed)
+                        .style(button::secondary)
+                        .width(Length::FillPortion(3))
+                        .padding(10),
+                    Space::with_width(Length::FillPortion(2)),
+                    button(text("Login").center().size(18))
+                        .on_press(Message::LoginPressed)
+                        .style(button::primary)
+                        .width(Length::FillPortion(3))
+                        .padding(10)
+                ]
+                .padding(padding::top(15)),
+            ]
+            .width(Length::Fixed(250.))
+            .spacing(20),
+        )
+    }
+
+    pub fn title(&self) -> std::borrow::Cow<str> {
+        let errors = [
+            self.login.error(),
+            self.password.error(),
+            self.login.warning(),
+            self.password.warning(),
+        ];
+        let error = errors.into_iter().flatten().next();
+
+        match &self.state {
+            State::None => error.map_or_else(|| "Login".into(), Into::into),
+            State::Requesting => "Requesting...".into(),
+            State::Error(e) => e.into(),
+        }
+    }
+}
diff --git a/3/coursework/src/view/src/authentication/register.rs b/3/coursework/src/view/src/authentication/register.rs
new file mode 100644
index 0000000..a3db851
--- /dev/null
+++ b/3/coursework/src/view/src/authentication/register.rs
@@ -0,0 +1,216 @@
+use crate::input::{Input, Validation};
+use crate::widget::centerbox;
+
+use iced::widget::{Space, button, checkbox, column, container, row, text};
+use iced::{Length, Task, padding};
+
+pub struct Register {
+    state: State,
+    name: Input,
+    email: Input,
+    password: Input,
+    repeat: Input,
+    show_password: bool,
+}
+enum State {
+    None,
+    Requesting,
+    Error(String),
+}
+
+pub enum Request {
+    SwitchToLogin,
+    SimpleValidation(Field),
+    Task(Task<Message>),
+    Register {
+        name: String,
+        email: String,
+        password: String,
+    },
+}
+pub enum Field {
+    Name(String),
+    Email(String),
+    Password(String),
+}
+
+pub enum RequestResult {
+    Error(String),
+    Validation(Field, Validation),
+}
+
+#[derive(Debug, Clone)]
+pub enum Message {
+    NameChanged(String),
+    EmailChanged(String),
+    PasswordChanged(String),
+    RepeatChanged(String),
+    ShowPasswordToggled(bool),
+
+    EmailSubmitted,
+    NameSubmitted,
+    PasswordSubmitted,
+    RepeatSubmitted,
+
+    RegisterPressed,
+    LoginPressed,
+}
+
+impl Default for Register {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Register {
+    pub const fn new() -> Self {
+        Self {
+            state: State::None,
+            name: Input::new("register_name"),
+            email: Input::new("register_email"),
+            password: Input::new("register_password"),
+            repeat: Input::new("register_repeat"),
+            show_password: false,
+        }
+    }
+
+    pub fn handle_result(&mut self, result: RequestResult) {
+        match result {
+            RequestResult::Error(e) => self.state = State::Error(e),
+            RequestResult::Validation(field, validation) => match &field {
+                Field::Name(s) => self.name.apply_if_eq(s, validation),
+                Field::Email(s) => self.email.apply_if_eq(s, validation),
+                Field::Password(s) => self.password.apply_if_eq(s, validation),
+            },
+        }
+    }
+
+    #[inline]
+    fn check_passwords(&mut self) {
+        if self.password.value() != self.repeat.value() {
+            self.repeat.set_error("passwords are different".into());
+        }
+    }
+    pub fn update(&mut self, message: Message) -> Option<Request> {
+        Some(match message {
+            Message::NameChanged(s) => {
+                self.name.update(s.clone());
+                Request::SimpleValidation(Field::Name(s))
+            }
+            Message::EmailChanged(s) => {
+                self.email.update(s.clone());
+                Request::SimpleValidation(Field::Email(s))
+            }
+            Message::PasswordChanged(s) => {
+                self.password.update(s.clone());
+                self.check_passwords();
+                Request::SimpleValidation(Field::Password(s))
+            }
+            Message::RepeatChanged(s) => {
+                self.repeat.update(s);
+                self.check_passwords();
+                return None;
+            }
+
+            Message::ShowPasswordToggled(b) => {
+                self.show_password = b;
+                return None;
+            }
+
+            Message::NameSubmitted if !self.name.submittable() => return None,
+            Message::NameSubmitted => Request::Task(self.email.focus()),
+            Message::EmailSubmitted if !self.email.submittable() => return None,
+            Message::EmailSubmitted => Request::Task(self.password.focus()),
+            Message::PasswordSubmitted if !self.password.submittable() => return None,
+            Message::PasswordSubmitted => Request::Task(self.repeat.focus()),
+
+            Message::RegisterPressed | Message::RepeatSubmitted => {
+                if !self.name.submittable() {
+                    Request::Task(self.name.focus())
+                } else if !self.email.submittable() {
+                    Request::Task(self.email.focus())
+                } else if !self.password.submittable() {
+                    Request::Task(self.password.focus())
+                } else if !self.repeat.submittable() {
+                    Request::Task(self.repeat.focus())
+                } else {
+                    self.state = State::Requesting;
+
+                    Request::Register {
+                        name: self.name.value().into(),
+                        email: self.email.value().into(),
+                        password: self.password.value().into(),
+                    }
+                }
+            }
+
+            Message::LoginPressed => Request::SwitchToLogin,
+        })
+    }
+
+    pub fn view(&self) -> iced::Element<Message> {
+        centerbox(
+            column![
+                container(text(self.title()).size(20))
+                    .center_x(Length::Fill)
+                    .padding(padding::bottom(10)),
+                self.name
+                    .view("Username")
+                    .on_input(Message::NameChanged)
+                    .on_submit(Message::NameSubmitted),
+                self.email
+                    .view("Email")
+                    .on_input(Message::EmailChanged)
+                    .on_submit(Message::EmailSubmitted),
+                self.password
+                    .view("Password")
+                    .on_input(Message::PasswordChanged)
+                    .on_submit(Message::PasswordSubmitted)
+                    .secure(!self.show_password),
+                self.repeat
+                    .view("Repeat Password")
+                    .on_input(Message::RepeatChanged)
+                    .on_submit(Message::RepeatSubmitted)
+                    .secure(!self.show_password),
+                checkbox("Show password", self.show_password)
+                    .on_toggle(Message::ShowPasswordToggled),
+                row![
+                    button(text("Login").center().size(18))
+                        .on_press(Message::LoginPressed)
+                        .style(button::secondary)
+                        .width(Length::FillPortion(3))
+                        .padding(10),
+                    Space::with_width(Length::FillPortion(2)),
+                    button(text("Register").center().size(18))
+                        .on_press(Message::RegisterPressed)
+                        .style(button::primary)
+                        .width(Length::FillPortion(3))
+                        .padding(10),
+                ]
+                .padding(padding::top(15)),
+            ]
+            .width(Length::Fixed(250.))
+            .spacing(20),
+        )
+    }
+
+    pub fn title(&self) -> std::borrow::Cow<str> {
+        let errors = [
+            self.name.error(),
+            self.email.error(),
+            self.password.error(),
+            self.repeat.error(),
+            self.name.warning(),
+            self.email.warning(),
+            self.password.warning(),
+            self.repeat.warning(),
+        ];
+        let error = errors.into_iter().flatten().next();
+
+        match &self.state {
+            State::None => error.map_or_else(|| "Register".into(), Into::into),
+            State::Requesting => "Requesting...".into(),
+            State::Error(e) => e.into(),
+        }
+    }
+}
diff --git a/3/coursework/src/view/src/input.rs b/3/coursework/src/view/src/input.rs
new file mode 100644
index 0000000..5e8a70a
--- /dev/null
+++ b/3/coursework/src/view/src/input.rs
@@ -0,0 +1,93 @@
+use crate::widget::text_input::{error, success, warning};
+
+use iced::widget::{TextInput, text_input, text_input::default};
+
+pub struct Input {
+    id: &'static str,
+    value: String,
+    warning: Option<String>,
+    state: State,
+}
+enum State {
+    None,
+    Valid,
+    Invalid(String),
+}
+
+pub enum Validation {
+    Valid,
+    Warning(String),
+    Invalid(String),
+}
+
+impl Input {
+    pub const fn new(id: &'static str) -> Self {
+        Self {
+            id,
+            value: String::new(),
+            warning: None,
+            state: State::None,
+        }
+    }
+
+    pub fn value(&self) -> &str {
+        self.value.as_ref()
+    }
+    pub fn error(&self) -> Option<&str> {
+        match &self.state {
+            State::Invalid(e) => Some(e.as_ref()),
+            _ => None,
+        }
+    }
+    pub fn warning(&self) -> Option<&str> {
+        self.warning.as_ref().map(AsRef::as_ref)
+    }
+    // pub fn submit(&self) -> Result<String, &str> {
+    //     match &self.state {
+    //         State::Invalid(e) => Err(e.as_ref()),
+    //         State::None | State::Valid => Ok(self.value.clone()),
+    //     }
+    // }
+    pub const fn submittable(&self) -> bool {
+        !matches!(self.state, State::Invalid(_))
+    }
+
+    pub fn update(&mut self, value: String) {
+        self.value = value;
+        self.warning = None;
+        self.state = State::None;
+    }
+    pub fn set_error(&mut self, value: String) {
+        self.state = State::Invalid(value);
+    }
+    pub fn set_warning(&mut self, value: String) {
+        self.warning = Some(value);
+    }
+    pub fn apply(&mut self, validation: Validation) {
+        match validation {
+            Validation::Valid => self.state = State::Valid,
+            Validation::Warning(w) => self.warning = Some(w),
+            Validation::Invalid(e) => self.state = State::Invalid(e),
+        }
+    }
+    pub fn apply_if_eq(&mut self, value: &str, validation: Validation) {
+        if self.value == value {
+            self.apply(validation);
+        }
+    }
+
+    pub fn focus<Message>(&self) -> iced::Task<Message> {
+        iced::widget::text_input::focus(self.id)
+    }
+    pub fn view<Message: Clone>(&self, placeholder: &str) -> TextInput<Message> {
+        text_input(placeholder, &self.value)
+            .id(self.id)
+            .padding(12)
+            .style(match self.state {
+                State::None if self.warning.is_none() => default,
+                State::Valid if self.warning.is_none() => success,
+                State::Invalid(_) => error,
+                _ => warning,
+            })
+    }
+}
diff --git a/3/coursework/src/view/src/lib.rs b/3/coursework/src/view/src/lib.rs
new file mode 100644
index 0000000..df79b91
--- /dev/null
+++ b/3/coursework/src/view/src/lib.rs
@@ -0,0 +1,7 @@
+mod widget;
+
+mod input;
+pub use input::Validation;
+
+pub mod authentication;
+pub use authentication::{Authentication, login, register};
diff --git a/3/coursework/src/view/src/widget.rs b/3/coursework/src/view/src/widget.rs
new file mode 100644
index 0000000..e9e3f7c
--- /dev/null
+++ b/3/coursework/src/view/src/widget.rs
@@ -0,0 +1,71 @@
+use iced::widget::{Scrollable, center, container, mouse_area, scrollable, text, tooltip};
+use iced::{Element, color};
+
+/// Put content into a dark container at the center of the screen
+/// which can be scrolled in multiple dirrections
+pub fn centerbox<'a, Message: 'a>(
+    content: impl Into<Element<'a, Message>>,
+) -> Element<'a, Message> {
+    center(scroll(
+        container(content).style(container::dark).padding(20),
+    ))
+    .into()
+}
+
+/// Scrollable but in both vertical and horizontal directions
+pub fn scroll<'a, Message: 'a>(content: impl Into<Element<'a, Message>>) -> Element<'a, Message> {
+    Scrollable::with_direction(content, scrollable::Direction::Both {
+        vertical: scrollable::Scrollbar::default(),
+        horizontal: scrollable::Scrollbar::default(),
+    })
+    .into()
+}
+
+/// Clickable url
+pub fn url<'a, Message: Clone + 'a>(txt: &impl ToString, msg: Message) -> Element<'a, Message> {
+    Element::from(mouse_area(text(txt.to_string()).color(color!(0xBB_B6_DF))).on_press(msg))
+}
+
+pub mod tip {
+    pub use iced::widget::tooltip::Position;
+}
+
+/// Tooltip with some styling applied
+pub fn tip<'a, Message: 'a>(
+    content: impl Into<Element<'a, Message>>,
+    tip: &'a str,
+    position: tip::Position,
+) -> Element<'a, Message> {
+    tooltip(
+        content,
+        container(text(tip).size(14))
+            .padding(5)
+            .style(container::dark),
+        position,
+    )
+    .into()
+}
+
+pub mod text_input {
+    use iced::widget::text_input::{Status, Style, default};
+    use iced::{Theme, color};
+
+    pub fn success(theme: &Theme, status: Status) -> Style {
+        Style {
+            background: color!(0x00_33_00).into(),
+            ..default(theme, status)
+        }
+    }
+    pub fn warning(theme: &Theme, status: Status) -> Style {
+        Style {
+            background: color!(0x33_33_00).into(),
+            ..default(theme, status)
+        }
+    }
+    pub fn error(theme: &Theme, status: Status) -> Style {
+        Style {
+            background: color!(0x33_00_00).into(),
+            ..default(theme, status)
+        }
+    }
+}